Plug



FIG. 1 is a lower front perspective view of the present invention;

FIG. 2 is a lower rear perspective view of the present invention;

FIG. 3 is a side elevational view of the present invention;

FIG. 4 is a upper front perspective view of the present invention; and,

FIG. 5 is a upper rear perspective view of the present invention. 

The ornamental design for a plug, as shown and described. 